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Reinforced Concrete Ductile Coupled Walls
While the greater ductility of coupled wall lateral systems compared to uncoupled wall lateral systems has been recognized in the engineering community for some time, prior US buildings did not distinguish the two. A Ductile Couple Wall lateral system has now been added to both ACI 318-19 and ASCE 7-22, which will allow engineers to use a higher R-factor of 8 for this system. The system comes with prescriptive requirements that ensure its highly ductile response. This presentation will go over this newly adopted lateral system, its associated design requirements and an illustrative design example on this system which will be included as Design Example 8 in the 2021 IBC SEAOC Seismic Design Manual
Seismic Design of Concrete Walls: SEAOC Seismic Design Manual Volume III, Examples 1 &2
SEAOC Seismic Design Manual Volume III Example 1 covers seismic design of a solid (cantilever) concrete wall, and Example 2 is a concrete wall with openings and coupling beams. Both examples will be presented in parallel, focusing on key concepts including: desired behavior of concrete walls, design for flexure, bar cut-offs and lap splices, design for shear, effect of gravity framing, detailing of wall boundaries, detailing of coupling beams, and wall stiffness. The presentation will draw on observations and lessons learned from past earthquakes, in addition to code requirements and recommendations from research.